[meteorite-list] First Tunguska Meteorite Fragments Discovered

From: Adam Hupe <raremeteorites_at_meteoritecentral.com>
Date: Thu, 2 May 2013 08:21:54 -0700 (PDT)
Message-ID: <1367508114.79213.YahooMailNeo_at_web122003.mail.ne1.yahoo.com>

Sounds like somebody has bypassed scientific protocol in order to get their 15 minutes of fame to me.? One of the items looks like a weathered out concretion!

It is embarrassing that this garbage was even published,


----- Original Message -----
From: Galactic Stone & Ironworks <meteoritemike at gmail.com>
To: Meteorite Mailing List <meteorite-list at meteoritecentral.com>
Sent: Thursday, May 2, 2013 8:16 AM
Subject: Re: [meteorite-list] First Tunguska Meteorite Fragments Discovered

Are those supposed to be meteorites?? The top one looks like an iron
meteorite.? The other two are obvious meteorwrongs.? If Tunguska had
been an iron, we would have found more of it by now.? I didn't even
bother to read the article, after seeing that joke of a photo.? LOL.

If somebody wants Tunguska specimens like these, contact me offlist -
I have plenty of geodes, magnetite, and assorted slags you can impress
with your friends with.? ;)

Best regards,


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On 5/2/13, Ron Baalke <baalke at zagami.jpl.nasa.gov> wrote:
> http://www.technologyreview.com/view/514511/first-tunguska-meteorite-fragments-discovered/
> First Tunguska Meteorite Fragments Discovered
> The Physics arXiv Blog
> May 2, 2013
> Nobody knows what exploded over Siberia in 1908 but the discovery
> of the first fragments could finally solve the mystery
> The Tunguska impact event is one of the great mysteries of modern history.
> The basic facts are well known. On 30 June 1908, a vast and powerful
> explosion engulfed an isolated region of Siberia near the Podkamennaya
> Tunguska River.
> The blast was 1000 times more powerful than the bomb dropped on Hiroshima,
> registered 5 on the Richter scale and is thought to have knocked down
> some 80 million trees over an area of 2000 square kilometres. The region
> is so isolated, however, that historians recorded only one death and just
> handful of eyewitness reports from nearby.
> But the most mysterious aspect of this explosion is that it left no crater
> and scientists have long argued over what could have caused it.
> The generally accepted theory is that the explosion was the result of a
> meteorite or comet exploding in the Earth's atmosphere. That could have
> caused an explosion of this magnitude without leaving a crater. Such an
> event
> would almost certainly have showered the region in fragments of the parent
> body
> but no convincing evidence has ever emerged.
> In the 1930s, an expedition to the region led by the Russian mineralogist
> Leonid Kulik returned with a sample of melted glassy rock containing
> bubbles.
> Kulik considered this evidence of an impact event.
> But the sample was somehow lost and has never undergone modern analysis.
> As such, there is no current evidence of an impact in the form of
> meteorites.
> That changes today with the extraordinary announcement by Andrei Zlobin from
> the Russian Academy of Sciences that he has found three rocks from the
> Tunguska region with the telltale characteristics of meteorites. If he
> is right, these rocks could finally help solve once and for all what kind
> of object struck Earth all those years ago.
> Zlobin's story is remarkable in a number of ways. The area of greatest
> interest
> for meteor scientists is called the Suslov depression, which lies directly
> beneath
> the location of the air blast and is the place where meteorite debris was
> most
> likely to fall.
> Dig into the peat bogs here and you can easily find layers that show clear
> evidence
> of the explosion. Zlobin said he dug more than ten prospect holes in the
> hope of
> finding meteorite fragments, but without success.
> However, he had more luck exploring the bed of the local Khushmo River,
> where
> stones are likely to collect over a long period of time. He collected around
> 100
> interesting specimens and returned to Moscow with them.
> This expedition took place in 1988 and for some unexplained reason, Zlobin
> waited 20
> years to examine his haul in detail. But in 2008, he sorted the collection
> and found
> three stones with clear evidence of melting and regmalypts, thumblike
> impressions
> found on the surface of meteorites which are caused by ablation as the hot
> rock falls
> through the atmosphere at high speed.
> Zlobin and others have used tree ring evidence to estimate the temperatures
> that the
> blast created on the ground and says that these were not high enough to melt
> rocks on
> the surface. However, the fireball in the Earth's atmosphere would have been
> hot enough
> for this.
> So Zlobin concludes that the rocks must be fragments of whatever body
> collided with
> Earth that day.
> Zlobin has not yet carried out a detailed chemical analysis of the rocks
> that would
> reveal their chemical and isotopic composition. So the world will have to
> wait for this
> to get a better idea of the nature of the body.
> However, the stony fragments do not rule out a comet since the nucleus could
> easily
> contain rock fragments, says Zlobin. Indeed he has calculated that the
> density of the
> impactor must have been about 0.6 grams per cubic centimetre, which is about
> the same
> as nucleus of Halley's comet. Zlobin says that together the evidence seems
> "excellent
> confirmation of cometary origin of the Tunguska impact."
> Clearly there is more work to be done here, particularly the chemical
> analysis perhaps
> with international cooperation and corroboration.
> Then there is also the puzzle of why Zlobin has waited so long to analyse
> his samples.
> It's not hard to imagine that the political changes that engulfed the Soviet
> Union in
> the year after his expedition may have played a role in this, but it still
> requires
> some explaining.
> Nevertheless, this has the potential to help clear up one of the outstanding
> mysteries
> of the 20th century and finally determine the origin of the largest Earth
> impact in
> recorded history.
> Ref: arxiv.org/abs/1304.8070: Discovery of Probably Tunguska Meteorites at
> the Bottom
> of Khushmo River's Shoal
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Received on Thu 02 May 2013 11:21:54 AM PDT

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